The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 2011
Filed:
Jul. 05, 2006
Kazuyuki Matsukawa, Kobe, JP;
Masao Kamada, Neyagawa, JP;
Wataru Tanaka, Katano, JP;
Kazuki Watanabe, Hirakata, JP;
Isao Nara, Agatsuma-gun, JP;
Yasuo Uemoto, Iga, JP;
Kazuyuki Matsukawa, Kobe, JP;
Masao Kamada, Neyagawa, JP;
Wataru Tanaka, Katano, JP;
Kazuki Watanabe, Hirakata, JP;
Isao Nara, Agatsuma-gun, JP;
Yasuo Uemoto, Iga, JP;
Panasonic Electric Works Co., Ltd., Osaka, JP;
Abstract
Light which tries to enter a diffuser plateat an angle which exceeds an angle at which a percentage of reflected light increases rapidly (that is, the incidence angle θ=70 degrees) is all reflected by a reflecting surfaceand then enters the diffuser plate. Therefore, a pseudo light source is formed by light which was collected near a connection point between adjacent reflecting surfacesout of the emitted light of the discharge lamps. So, the brightness between the adjacent discharge lampsis increased, and it is possible to reduce unevenness in brightness. Furthermore, since the discharge lampis housed inside the reflecting surfacewhose cross-sectional shape is a parabola, it is possible to reduce the distance between a reflecting plateand the diffuser plate, as compared with the prior art, and to reduce the thickness dimension in the anteroposterior direction.